You know, Death Note sounds incredibly bad when you forget to mention the part about the actual Death Note, I mean what you said is technically true but… 
Anyway a lot of good ones mentioned, a few that haven’t been touched on:
I’ve heard good things about Geobreeders and Samurai Girl: Real Bout High School, I’ve only seen one episode of each. The first was pretty cool, the second was not in my taste, but I could see myself watching it with nothing else to do.
Vampire Hunter D was pretty much made for Western Audiences (much like Cowboy Bebop was, though the series aren’t compatible at all), wasn’t my favorite, it’s a C+, the OVA was okay though.
FLCL/Fooly Cooly: They spent 24 episodes worth of production budget on 6 episodes. It’s very well done, but is incredibly confusing. You may have to watch it a few times. My friend and I are currently on a bet about whether we understand it because there really is an allegory or if it just fucked up our brains to think in FLCL logic. This is possibly one of, in not my favorite anime.
Neon Genesis Evangelion: Not the absolute best, but considered a “must, even if you hate it” by some people. It falls apart into incomprehensibility in the last few episodes, even after you watch the movies it can be crazy. One of the rules of the universe is “we do NOT, under any circumstances, discuss the ending of NGE.”
Serial Experiment: Lain - It’s love or hate, I like it, but it’s even more confusing that Neon Genesis Evangelion and FLCL, I’m pretty sure if you bred the production teams of NGE, FLCL, and SE:L (and maybe Haruhi Suzumiya) and had those children produce an anime the universe would explode. This anime doesn’t have episodes, it has layers. And wikipedia can’t even come up with a plot, it has theories about the plot, because there isn’t actually any fan agreed upon plot that I’m aware of.
One of the .hacks. Not sure which one it was, I think it was an OVA. In this one there was actually an epidemic for people who were playing the game (The World) randomly passing out and getting stuck. The main character was female. This is the only .hack I actually like (sorry guys, I’ll turn in my badge //sign was boring as hell, no dialogue, no action, just… scenery. It felt like it at least Music was good though) I think it’s .hack//Limnality I’m thinking of, but I’m not sure.
Märchen Awakens Romance (Mär Heaven). I love this anime. The English Dub died really fast, but I found it to be a really well done show, then again I have no taste.
G Gundam is good, and was the first anime I really watched knowing what anime was (as opposed to “that show on Cartoon Network” like, say Tenchi or Sailor Moon, which i still hold dear to me). It’s good, but pretty cheesy when I tried to watch it again. It’s not the best animated thing ever, but I (gasp another badge revoked) like it more than Mobile Suit, SEED and whatnot.
Berserk and Claymore have droves of fanbois, they’re good if you like Dark Fantasy, if you don’t… run away.
There’s also the obvious ones everyone knows about (Naruto, Dragonball, Sailor Moon, Cardcaptor etc) even if they’re not into Anime, but I’ll leave whether they want to see them or not as an exercise to the reader.